Security has been stepped up in different areas of the city on Thursday due to terror threat. According to details, several routes in the Clifton area have been closed for traffic as the high-security alert has been issued from Sindh Home Department. The traffic police officials are diverting the traffic towards alternate routes due to closure of different roads in the Clifton. The roads in Clifton have been closed for traffic as consulate general offices of different countries have been located at the following routes. Following a terrorist attack at the Pakistan Stock Exchange (PSX) building last month, a security high alert was declared across the country to avoid any other possible attack. Local media quoted official sources as saying that all the security departments have been advised to keep vigilant at all important official buildings and installations. Islamabad’s Inspector General of police Muhammad Amir Zulfiqar Khan issued a security high alert and directed all senior officials to remain at their zones. Earlier in the day, a policeman was martyred in a gun attack in Karachi’s Jutland Lines. The martyred ASI was identified as Ghulam Muhammad. It is pertinent to mention here that at least 11 people had been killed and several others injured after four suspected terrorists stormed the Pakistan Stock Exchange (PSX). According to police, those killed included the four attackers. The Baloch Liberation Army (BLA) had claimed responsibility of the attack. Six security officials and one citizen had been martyred and four attackers killed when the terrorists opened fire and tossed a grenade at the entrance to the PSX building, Karachi police chief Ghulam Nabi Memon had said.